Abstract: The sound radiation area of the sheet metal part of the air conditioner outdoor unit is large, and the vibration damping and noise reduction design can effectively reduce the noise decibel value of the outdoor unit and improve the sound quality of the experience. The valve plate is in direct contact with the external compressor pipeline of the air conditioner, which is an important part on the vibration path. In order to explore the valve plate structure with vibration damping effect, the modal, response and acoustic radiation simulation iterative optimization design was carried out. The modal and response simulation results show that compared with the single-layer valve plate structure, the double-layer valve plate structure can effectively attenuate the vibration energy transmitted to the right plate, and the best vibration damping effect can be achieved when the second layer bulge height is 6 mm. At this time, the maximum acceleration response of the right plate in the 0~200 Hz range is reduced by about 20%. It is actually measured that the acceleration and vibration value of the right plate is reduced by about 12% after using the valve plate struct. The results of acoustic radiation simulation show that optimizing the valve plate structure can reduce the radiation noise of the right plate by about 16% in the 200 Hz~400 Hz range.

Key words: Air conditioning, Sheet metal structure, CAE